Of course they are. (Score 0, Troll)

I absolutely love my Logitech MX Revolution, which is in the same series as the previous great mouses MX 1000 etc. They are so much nicer and better to use than just some cheap office mices. On the other hand, I also have one Razer mouse that was supposedly good for gaming, but I like my MX Revolution more. Like usual expensive doesn't always mean great, but great mouses can get expensive. Likewise I love my Logitech G19 gaming keyboard with macro keys, led etc. It improves your usability a lot.